Once upon a time, in a far-off land, there lived a little girl named Lily. She was a curious child who loved to explore and learn new things. One day, while playing in the park, she came across a strange object - a model of a tree made of glass.
Intrigued, she picked it up and noticed that it was divided into many little parts, each connected to one another like a puzzle. She learned that each part was called a "node" and that they formed a structure called an "octree."
As she played with the model, she noticed that some nodes had a negation sign on them. She asked her parent what it meant and was told that it meant "not."
Lily became fascinated with the model and spent hours studying it, trying to understand how it worked. She discovered that each node had a specific occurrence and that each node could be a parent or a child to another node.
One day, she had an idea. She wanted to find a path through the octree that would lead her from the top of the tree to the bottom, without passing through any nodes with a negation sign.
She started at the top node and carefully made her way down, following the connections between the nodes. At times, she came to a null node and had to backtrack and find another path.
After many tries, Lily finally found the correct path and reached the bottom node of the octree. She was overjoyed and couldn't wait to show her parent her discovery.
From that day on, Lily continued to explore and learn about the amazing world of models and octrees, always eager to discover new paths and solve new puzzles.
The end.
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